William robert welke



(NoMoael.) l

f W. R. WELKE.

REAMER.

No'. 443,690. Patented Deo. 30, 1890.

no mom'uwo., wAsmmrmu n c v UNITED vSTATES ATENT FFICE.

WILLIAM ROBERT \VLKE, OF DALLAS, TEXAS, ASSIGNOR OF ONE-HALF TO XV. J. AND C. L. BETTERTON, OF SAME PLACE.

REAM ER.

SPECIFICATION forming part of Letters Patent No. 443,690, dated December 30, 1890.

Application led July 25, 1890. Serial No. 359,875. (No model.)

T LZZ whom it may concern.'

Be it known that l, WTLLIAM R. WELKE, a citizen of the United States, residin gat Dallas, in the county of Dallas and State of Texas,

have invented certain new and useful Improvements in Reamers; and I do hereby declare the following to bea full, clear, and eX- act description of the invention, such as will enable others skilled in the art to which it Io appertains to make and use the same.

My invention relates to reamers for use in boring artesian wells and other similar purposes; and it consists, essentially, of a hollow cylindrical body adapted to be attached to a suitable drivinghead and provided with peripheral expansion-cutters operated by an internal plunger, all as hereinafter fully described, illustratedin the drawings, and specifically' pointed out in the claims.

:o Referring to the accompanying drawings, wherein like letters of reference point out similar parts in all the figures, Figure 1 is a longitudinal sectional view of my reamer with cutters sheathed and inserted in a well-casing. Fig. 2 is a similar sectional view showing cutters thrown out ready for action after leaving end of well-casing. Fig. 3 is a side view of the reamer.

In the drawings, A is a hollow cylinder, of suitable length, with upper end a shaped and adapted for attachment to suitable driving mechanism. Pivoted by their upper narrow ends within rectangular openings in the sides of the cylinder A are two or more cutters C, of approximately triangular shape. Within the cylinder A plays a plunger B, having depressions h to receive the cutters when they are retracted. Somewhat above the upper ends of the depressions Z7, and between them, a spring-catch h is attached to the plunger, its upper or free end being confined within the cylinder A when the plunger is slid down, and protruding through an opening d when the plunger is slid up. The purpose of this catch will appear more particularly hereinafter.

Extending downwardly from the lower end of the plunger B is a guide-rod B of reduced diameter, whose lower end plays within an crilice in a bridge or cross-piece d, ex- 5o tending from side to side of the cylinder A. This bridge a also serves as a lower abutment for a coiled spring S, which encircles the guide-rod and passes upwardly against the plunger B.

The operation of my invention thus described is as follows: The tool, being attached to a driving-head, is placed within the casing, supposed to be already fitted to the upper part of thewell, andthe plunger pushed down by 6.o means of the protruding end of the springcatch b till the cutters fall within the depressions in the plunger, where they will be retained by pressure against the well-casing, as shown in Fig. l. The whole is then low ered. The end of the casing having been reached and there no longer being a retaining force to keep the cutters sheathed they will be forced out by the rising of the plunger B as it is forced up by the spring S. (See Fig. 7o 2.) The tool then cuts downwardly through the rock or other refractory material, and when it is desired to remove it the action is as follows: The cylinder rises, and conse quently the spring-catch b also protruding, until the bottom of the well-casing is reached. The spring-catch b rst reaches the casing, and, catching onto the lower edge thereof, is pushed downwardly as the tool rises, carrying with it the plunger B. When the plunger 8o has been pushed down sufciently, the cutters fall into the depressions b and lie flush with the surface of the cylinder A, thus permitting an unobstructed withdrawal of the whole tool. '8 5 Having described my invention, what I claim, and desire to secure by Letters Patent of the United States, is=

1. In a reamer, the cylinderA,provided with pivotally-hung triangular cutters C, in com- 9o bination with a plunger B, having depressions y registering with the cutters when said plunger is depressed, a catch b for depressing the plunger, a guide-rod b, extending downwardly from said plunger, a bridge apertured 9 5 to receive said guide-rod, and a spring reacting between the bridge and the plunger to keep said plunger normallypressed upwardly,

all as and for the purpose i11tended,snbSia11 tially as describe( 2. In a remuer, the cylinder A, plunger B, cutters C, spring-catch b', guide-rod b, spring 5 S, and bridge, all in combination, as and for the purpose intended, substantially as described.

In testimony whereof I aii'ix 1n y si gnatu re in presence of two Witnesses.

4WILLIAM ROBERT WELKE Witnesses:

' A. XV. MAY,

(i. E ALTERMANN. 

